@book { ElectronicRealEstateinEurope,
    title = "Electronic Real Estate in Europe",
    author = "Jan-Philip {von Gottberg}",
    year = "2008",
    publisher = "Diplom.de",
    address = "Hamburg, Deutschland",
    doi = "10.3239/9783836624060",
    url = "https://m.diplom.de/document/226422"
}